Booked on AC550 YVR - LAX this Tuesday Aug 15 on a flex ticket but the seat map is full so I wasn't able to choose a seat without paying for preferred. Normally I'd rely on checking in at T24 to maximize my chances of not being bumped. But this time, the twist I've never come across before is when looking at AC.com today, all economy fares are no longer for sale, only J seats. Furthermore, AC572, the next flight out, isn't listed for sale at all anymore. So now I'm worried. Should I just bite the bullet and pay for preferred seats for two of us travelling on the same PNR? Appreciate any advice.